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S

cripts Developed for New dbms_scheduler Utility


October 22, 2004

Oracle Guru Jim Czuprynski has just published a good article on the exciting new
dbms_scheduler package:

http://www.dbasupport.com/oracle/ora10g/10g_scheduler.shtml

Jim notes that dbms_scheduler is far more powerful than the dbms_jobs package and
he provides some very useful techniques and scripts:

Basic Task Scheduling. First off, fear not! The Scheduler does keep the basic functionality
of DBMS_JOB intact:

  a.. A task can be scheduled to run at a particular date and time.
  b.. A task can be scheduled to run only once, or multiple times.
  c.. A task can be turned off temporarily or removed completely from the schedule.
  d.. Complex scheduling is still available, but now much simpler. (For example, DBMS_JOB could be manipulated into running a task every Tuesday, Thursday and Saturday
at 08:00, but it did take some experimentation with NEXT_DATE and the INTERVAL parameter of DBMS_JOB before I got it right.)

Jim also has a follow-up article that shows even more powerful dbms_scheduler features:

http://www.dbasupport.com/oracle/ora10g/10g_scheduler2_1.shtml

Best of all, Czuprynski shows a suggested series of steps for converting from dbms_jobs
to dbms_scheduler:

Transitioning from DBMS_JOB to DBMS_SCHEDULER
To make the transition from using DBMS_JOB to DBMS_SCHEDULER, I suggest the following steps:

a.. Identify all currently active scheduled tasks that were scheduled via DBMS_JOB,
including their scheduled run times.
a.. Analyze these tasks and identify any "overlaps" among the DBMS_JOB
scheduled tasks. These overlaps might include identical tasks being run at different
times; tasks being run in parallel; or tasks being run serially.
a.. Convert tasks scheduled via DBMS_JOB into their corresponding DBMS_SCHEDULER
components (program, schedule, and job objects):
a.. "Break" the currently scheduled task to make sure that duplicate
tasks don't fire off at the same time:
BEGIN
DBMS_JOB.BROKEN(<job>, TRUE);
...
COMMIT;
END;
/
b.. If the task is essentially a stand-alone task, use DBMS_SCHEDULE.CREATE_JOB
to create a new instance of the task.
c.. If several tasks can benefit from reuse, then, use DBMS_SCHEDULE.CREATE_JOB,
DBMS_SCHEDULE.CREATE_PROGRAM, and DBMS_SCHEDULE.CREATE_JOB to create the required
components and start them running on schedule.
a.. Once the conversion is complete, then remove all the tasks using DBMS_JOB.REMOVE:.
BEGIN
DBMS_JOB.REMOVE(<job>, TRUE);
...
COMMIT;
END;
/


 

 
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